Removable-tip electric soldering iron



April 25, 1950 c. G. R. NORDSTROM' REMOVABLE T'IP ELECTRIC SOLDERING IRON 5 Sheets-Sheet 1 Filed March 14, 1946 inventor CARL Guam: Farr/Q10 Ma/eosrkm MWV? C. G. R. NORDSTROM REMOVABLE TIP ELECTRIC SOLDERING IRON April 25, 1950 5 Sheets-Sheet 2 Filed March 14, 1946 April 25, 1950 c. G. R. NORDSTROM REMOVABLE TIP ELECTRIC SOLDERING IRON 5 Sheets-Sheet 3 Filed March 14, 1946 April 25, 1950 c. G. R. NORDSTROM REMOVABLE TIP ELECTRIC SOLDERING IRON 5 Sheets-Sheet 4 Filed March 14, 1946 ARL 60am; Raw/R10 lYokosr/wm April 25, 1950 c. G. R. NORDSTROM REMOVABLE TIP ELECTRIC SOLDERING IRON 5 Sheets$heet 5 Filed March 14, 1946 a? lii l'm enor GmL Casi-Ar EE/YFKIO News mm a, mw in P atented Apr. 25, 1959 REMOVABLEHTIRELECTRIC SOLDERING IRON Carl Gustay iltenfrid N ordstriorn, Stockholm, Sweden Application March 14, 1946, Serial No. 654,273 In Sweden March 29, 1945 3 Claims. 1

The present invention refers to. an arrangement, in electric, olderingshuns, wherein a substantially rod-shaped bolt 01' so-called point is attachable in a sleeve-shaped casing provided with an electric'heatingwire, said casing being suitably .cfimlected with a handle adapted for the manipulation of the tool. In soldering-irons of this type, the soldering point is subjected to wear. depend ng generally on h m rosion from soldering agents. The point thus requiresto. be replaced by another one from time to time. It has been found, however, that the soldering points become so rigidly connected to the casing owingto accumulation of oxide or socalled slag on the attached part as to permit of loo ening from t y a ng only With difiicu-l or only by deformation of the casing. The exchange of the soldering points must of course only take a few minutes, if the soldering-iron is to be regarded as serviceable for industrial use. Owing to the slag coating, however, the bolts will sometimes have to be sent to special shops for the purpose of exchanging the points. Add to this that industries, where electric solderingirons are comprised in the tool equipment, are themselves desirous of manufacturing the points of the soldering-irons. For this reason it has been feundconvenient to make use-of points from a vrod-shaped material of a circular cross section.

The invention obviates the above-mentioned ing-iron with a handle and a portion of an electric supply cable secured thereto. Fig. 2 is a partly section elevation of the heating wire casing of the bolt with a portion of a soldering point inserted therein. Fig. 3 is a cross section on line 3-3 in Fig. 2. Fig. 4 is a cross section on line o e in Fig. 2-. Fig. 5 shows a second embodirnent represented as in Fig. 2. Figs. 6 and 7 are cross sections on lines 6-6 and 'l-l', respectively, in Fig. 2. Fig. 8 shows a third embodiment represented as in Fig. 2. Figs. 9 and 10 are cross sections on lines 9-9 and Ill-H], respectively. Fig. 11 is an axial section through a fourth ema. circular cros section, and is chisel-shaped at the outer end thereof. Thev point may thus be simply manufactured from a round rod, for instance from copper or a copper alloy. The supply cable of the soldering iron, which is desige nated by E, is connected inan arbitrary suitable manner to a heating wire winding F in the case ing B.

In the te m o embodime sh wn i Figsthe heating wire casing Bconsists of an outer jacket 3 and an inner jacket 4, between which the heating Wi Winding? is arranged. As will appear from Figs. 3 and .4, the point D bears along the lower half'of its cylindrical surface directly on the inner jacket 4, whereas the upper half of vsaid surface is in heat conductive connection with the casing through the agency of two wedge-shaped filling bodies 6 and l. The body 5 is. made with a crescent-shaped cross section, the inner and outer surfaces thereof ccnstituting circular cylinder surfaces. Said may a r nw rd y nd is a n d t o operate 'with'the inner surface of the body I, which latter tapers outwardly. Owing to the wedge effect between these bodies, a good heat contact is obtained for the point D. To ensure proper bearing also at the inner end of the point. the body 7 is formed in this place with a tongue 8 forming a guide surface, which is positioned obliquely relatively to the point. A bottom 9 in the casing F forms a stop for the filling body I when the point D is introduced. The body 6 as well as the body 1 may be arranged on the point, when the latter is introduced into the casing. When the point is to be removed from the casing, the filling body 8 is removed first, said body being for this purpose formed with a flange I adapted to be actuated by means of a hammer, chisel or the like. Obviously, the body 6 may also be loosened with the aid of a pair of tongs or a vise. Upon the removal of the body 6, the point may be readily taken out of the casing. The filling bodies are preferably made from metal of good heat conducting properties. On account of the fact that the point is in contact with heat con- 3 ducting surfaces under a great pressure, an effective transfer or" the heat will be obtained.

The modification shown in Figs. 5-7 difiers from the embodiment above described sub stantially by the fact that the filling body has been omitted, while the inner jacket 4 has been formed with a funnel-shaped inner surface corresponding to the taper of a filling body 6 constructed broadly in the same manner as the body 6 in the construction shown in Fig. 2. The body 6, which may be removed from the casing by the actuation of a flange it, provides for a perfect heating contact at the outer part of the casing. At the inner part of the casing, a body I6 is secured in a groove l5, said body having the same function as the inwardly bent tongue 8 in Fig. 1, so that the inner portion of the point will also be pressed to bear properly on the heating wire casing.

The embodiment shown in Figs. 8-10 differs from the one described substantially by the fact that the filling body is constituted by a rodshaped filling bar I! arranged along the portion of the point D introduced into the casing. The inner end of the bar may be bevelled off, however, to cooperate with a portion l8 of the inner jacket 4 positioned obliquely relatively to the axis of the point. For the purpose of ensuring the requisite bearing pressure at the mouth portion of the casing, the filling bar I! is adapted to be pressed against the point by means of a screw !9 introduced radially through the edge portion of the casing. An exchange of the soldering point is eiiected upon loosening of the screw 19 and removal of the bar H, which may be provided for this purpose with a flange 20 on the portion thereof projecting outside the casing B,

Finally, Figs. 11 and 12 show a construction, wherein the inner contact surface of the heating wire casing is purely conical and thus of a simpler geometrical shape than in the examples described above. The inner wall 2| of the heating casing is made of a comparatively great wall thickness at the inner portion, and is formed with an outer funnel-shaped portion 22 adapted to receive a conical filling body 23. This body is formed with a cylindrical aperture adapted to receive the point D. For the purpose of ensuring a perfect bearing contact between the point and the body 23, the latter is provided with slits 24 and 25 in two mutually perpendicular axial planes, said slits 4 extending alternately from the outer and the inner end.

What I claim is:

1. An electric soldering iron comprising a hollow substantially cylindrical casing provided with electric heating wire and a substantially rodshaped soldering point held in said casing and protruding partly therefrom, in which a portion only of the interior surface of said casing bears against said point and the remaining portion is spaced therefrom by a removable heat conducting wedge-like filler consisting of two separable parts, longitudinally and oppositely tapered, arranged within the space between said remaining 1 surface of said casing bears against said point,

a removable two part wedge in the space between the remaining portion of said point and said casing, said wedge being crescent shape in cross section, one part pressing against said point tapering inwardly and arranged to cooperate with the second part of said wedge which tapers out- Wardly.

3. Soldering iron, as claimed in claim 1, in which the second part of said wedge is provided with a tongue positioned obliquely with respect to said point, said tongue acting as a guide and bearing against the inner end of said point.

CARL GUSTAV RENF'RID NORDSTRGM.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 269,608 Wain Dec. 26, 1882 618,639 Bullard Jan. 31, 1899 1,308,994 Rohne July 8, 1919 1,316,368 Hand et a1 Sept. 16, 1919 1,378,091 Carlsen May 17, 1921 2,064,645 Abott Dec. 15, 1936 

